Prompt for "illegal operations" analysis when Windows 7 applications

Failure phenomenon:
Windows 7 System opens some application prompts "illegal operation"
Solution:
This type of failure causes more reasons, there are several possible:
1. system files are changed or corrupted.
2. The driver is not properly installed, such failures generally appear on the graphics driver, if this is caused, open some game program will produce illegal operation prompts.
3. Bad quality of the memory stripe.
4. Sometimes when the program is running, if the driver of the sound card is not installed, this kind of failure, such as the landing battle, if the sound card driver is not installed, the runtime will produce illegal operation error.
5. Incompatibility between software.